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Now showing 1 - 5 of 6
  • Publication
    European Transport / Trasporti Europei
    (EUT Edizioni Università di Trieste, 2007)
      707  1291
  • Publication
    Bus speed estimation by neural networks to improve the automatic fleet management
    (EUT Edizioni Università di Trieste, 2007)
    Salvo, G.
    ;
    Amato, G.
    ;
    Zito, Pietro
    In the urban areas, public transport service interacts with the private mobility. Moreover, on each link of the urban public transport network, the bus speed is affected by a high variability over time. It depends on the congestion level and the presence of bus way or no. The scheduling reliability of the public transport service is crucial to increase attractiveness against private car use. A comparison between a Radial Basis Function network (RBF) and Multi layer Perceptron (MLP) was carried out to estimate the average speed, analysing the dynamic bus location data achieved by an AVMS (Automatic Vehicle Monitoring System). Collected data concern bus location, geometrical parameters and traffic conditions. Public Transport Company of Palermo provided these data.
      1308  2788
  • Publication
    Choice of departure station by railway users
    (EUT Edizioni Università di Trieste, 2007)
    Debrezion, Ghebreegziabiher
    ;
    Pels, E.
    ;
    Rietveld, Piet
    This paper applies a multinomial logit model to the choice of a departure railway station by Dutch railway passengers. This is a relevant theme since about 50% of Dutch railway passengers do not travel via the nearest railway station. The passengers’ choices for departure stations are aggregated at the four digit postal code area level. We applied three functional forms for the underlying systematic utility of a station, namely a linear effect of attributes, cross effect of distance and frequency of service, and a translog formulation on distance and frequency of train services. With 3,498 post code areas and 360 railway stations our analysis found consistent effect sizes for distance, frequency of service, intercity status of the station and the presence of park-and-ride facility on the choice of departure station. The effect of distance on the choice of a departure station declines smoothly. The effect of frequency of service is relatively small compared to the effect of distance. A frequency of service increase by a hundred trains per day is equivalent to being 600 m closer to the station. The Intercity status of the station plays the biggest role in the choice of departure station. It has an equivalent effect of a change in 2 km distance or about a frequency of service of 300 trains per day. In addition, the presence of park-and-ride facility in the station poses a sizable effect in the departure station choice. In most cases its effect reaches about 35% of the intercity status effect.
      1074  1526
  • Publication
    A systematic comparison of continuous and discrete mixture models
    (EUT Edizioni Università di Trieste, 2007)
    Hess, S.
    ;
    Bierlaire, Michel
    ;
    Tzannatos, E. S.
    Modellers are increasingly relying on the use of continuous random coefficients models, such as Mixed Logit, for the representation of variations in tastes across individuals. In this paper, we provide an indepth comparison of the performance of the Mixed Logit model with that of its far less commonly used discrete mixture counterpart, making use of a combination of real and simulated datasets. The results not only show significant computational advantages for the discrete mixture approach, but also highlight greater flexibility, and show that, across a host of scenarios, the discrete mixture models are able to offer comparable or indeed superior model performance.
      1102  1755
  • Publication
    Air traffic management in the South East European countries. Current situation and prospects
    (EUT Edizioni Università di Trieste, 2007)
    Matsoukis, Evangelos
    ;
    Poulimenakos, S.
    This paper deals with the Air Traffic Management (ATM) situation in the South East Europe (SEE) countries. The current status indicates that the SEE air space users require increased capacity, higher flexibility and improved cost efficiency. On the other hand, some of these countries were in a war situation a few years ago, and now they are seeking a regional cooperation to ensure regional stability and prosperity towards their integration to the European Union. The paper starts with a description of the cooperation schemes, already in operation in the area. Then the attempt to converge the ATM of the region towards the EU Single European Sky is investigated. The FABA (Functional Airspace Block Approach), a European Union (EU) initiative, applied in the SEE is presented in detail. In the continuation, the paper reports on the definition phase of the SEE FABA initiative, which is to provide a well founded basis for the reorganisation of the SEE air space into FAB’s. It is concluded that the FAB solution stemming from the EU Single European Sky policy is feasible, highly beneficial and necessary for the SEE region development.
      959  1731